Mozilla Foundation Security Advisory 2005-05

Input stealing from other tabs

Announced

January 21, 2005

Reporter

Jakob Balle (Secunia)

Impact

High

Products

Firefox, Mozilla Suite

Fixed in

Firefox 1

Mozilla Suite 1.7.5

Description

Jakob Balle of Secunia reported two vulnerabilities in windows with multiple
tabs. Malicious content in a background tab can attempt to steal information
intended for the topmost tab by popping up prompt dialog that appears to come
from the trusted site, or by silently redirecting input focus to a background
tab hoping to catch the user inputting something sensitive.

Jesse Ruderman and Martin Wargers discovered variants

Workaround

Do not open sites with sensitive content in the same window as tabs from
untrusted content. Upgrade to fixed version.